it is likely to be 和there is likely to be区别

题目

it is likely to be 和there is likely to be区别
__a foreign teacher to give then lesssons next term.为什么不能用it is likely to be?

答案

同学,
前者表示有可能,后者表示可能有,句子意思是“下学期可能有一位外教给他们上课”,所以用后者.